Abstract
Two patients were presented, and two previously unreported observations were made. Patient 1, a 50 year old man with episodic palpitations and dizziness for 10 years, exhibited initiation of idiopathic ventricular tachycardia (VT) by atrial fibrillation (AF). Patient 2, a 43 year old woman with a structurally normal heart but recurrent palpitations for one year, demonstrated fusion and capture beats during simultaneous VT and AF. An explanation is given as to why the latter phenomenon is rarely observed. Keywords: ventricular tachycardia; atrial fibrillation; atrioventricular nodal conduction
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Figure 1 .
Twelve lead ECG with endocardial recordings from patient 1 during electrophysiological study showing initiation of the ventricular tachycardia (VT) by atrial fibrillation (AF). HRA, high right atrium; HIS, His bundle; RV, right ventricle. Note the long (1140 ms)-short (450 ms) RR cycle length sequence during AF preceding the initiation of VT.
Figure 2 .
Twelve lead ECG with endocardial recordings from patient 2 during simultaneous VT and AF showing narrow QRS beats. (A) A capture beat; (B) A fusion beat. Note the His bundle electrogram preceding both narrow QRS beats.
Selected References
These references are in PubMed. This may not be the complete list of references from this article.
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